Scientists redefine rules for where life could exist on alien planets

01/30/2013 | Space.com

Scientists have updated the boundaries for a "habitable zone," where life could exist in a solar system. While the guidelines add additional planets, it also removes some from the list. Even Earth is on the very inner edge of our solar system's habitable zone. The definition is based on updated atmospheric databases that record the planet's absorption of water and carbon dioxide, properties that help determine whether the planet could have liquid water.

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